Device for joining carbon electrodes



March 22, 1932. 'PEL-rz 1,850,515

DEVICE FOR JOINING CARBON ELEcTRoDEs Filed Jan. 15, 1931 LA f Ll.T i-

@fr WM@ Cav Patented Mar. 22, 1932 GEORG PELTZ, 0F LA'G'TAWERK/LAUSITZ, GERMANY DEVICE FUR JONING- Application led IJanuary 13,193, Serial No.

ln electro-metallurgy more particularly in the manufacture of aluminium by reduction of bauxite, the use of electrode carbons causes very many difficulties especially when there are large separate anodes which ccnsist either of one piece or of partial anodes which are joined together and operate as an unit. Such an anode should operate continuously in order that damage to the bath caused by eX- change, which take up much time, may be avoided. This can only be eected by pro- `viding a nipple. Simple carbon nipples which by means of screw threads or other arrangements press the anode parts together have failed because no means was provided to hold them so close together and to keep them so during operation, that there was no loosening. As soon as this unavoidable loosening occurs there are resistances to the current, the joining parts begin to overheat and the lower part of the anode reaches the bath before the nippled part has come near to the bath. The use of nipples of the same met-al as was produced in the bath is also impossible because it is melted before the part ci the anode which is secured by thenipple reaches the bath. Metals of higher melting point as nipple material lead to undesirable forma'- tion ot alloy. rllhe combined iron carbon nipple which forms the subject of the present invention prevents the disadvantages referred to and ensures continuous and satisfactory operation. rThe nipple is illustrated by way or's example in the accompanying drawing.

The device consists of:

t the carbon nipple, the iron nipple, e the connecting rod between the iron nipple and the nut j@ an abutment bearing and gf the nut provided with a hand wheel or knob. The carbon nipple as well as the anode carbon to be placed over it have grooves at c which receive rings of current conducting material.

ln assembling the carbon nipple is screwed with its lower part into the anode section which is in operation. After this the various bearing surfaces of both parts of the anode and nipple are coated with electrode cement. The part to be attached is pushed CARBDN ELECTRODES 508,544, and in Germany January 23, 1930.

over the nipple 8p that both anode parts are firmly in contact at the joint place d. The iron nipple b by means of the rod e is now screwed into the carbon nipple a from above, the abutment plate f is put in position and the nut g is screwed on. By screwing up the nut g the anode sections are pressed tightly together. lf a rise in the bath voltage indicatcs that a loosening has taken place it is only necessary to screw up the nut g more tightly. rlthis device for pressing the parts together has the further great advantage that with its assistance anodes which are not round may be attached without it being necessary, as would otherwise be the case, to adapkt; the one part of the anode to the other.

at l claim is:

l. Means for securing two sections of a carbon electrode together comprising a carbon nipple securelyattached to the lower part of the electrode and projecting into a recess in the lower end of the upper part, a second nipple mounted in the top of the first nipple and manually operatedl means for drawing said second nipple to cause the lower electrode section to be drawn tightly into engagement with the upper electrode section. y

2. Means for securing two sections of a carbon electrode together comprising a carbon nipple securely attached to the lower part of the electrode and projecting into a recess in the` lower end of the upper section of the electrode a second nipple provided in the top of the first nipple, said second nipple being screwed into an internally screw threaded hole in the first nipple, a rod being connected to said second nipple and extending through a bore in said upper part of the electrode and a nut being provided on the top of said rod for drawing said rod upwardly.

3. Means for securing two sectionsr'of a carbon electrode together comprising a carbon nipple securely attached to the lower part of the electrode and projecting into a recess of the lower end of the upper section of the electrode asecond nipple provided in the top of the first nipple, said second nipple being screwed into an internally screw threaded hole in the first nipple, a rod being 2 Lemme connected to said second nipple and extending through a bore in said u per section of the electrode a plate on top o the upper section of the electrode the rod being supported 5 thereon.

' 4. Means for securing two sections of a carbon electrode together comprising a carbon nipe screwed into the lower part of the electro e and facing against shoulders in the upper section of the electrode, a second iron. nifple mounted in the top of the first nipple an manually operated means 4for drawing said second nipple to cause the lower electrode section Ato be drawn tightly into enga'ement with the up r electrode section.

n testimony whereo I ax my signature.

- GEORG PELTZ. 

